Method for gauging material



March 1, 1 960 s Sheets-Sheet 1 Filed April 22, 1957 EDGAR J. BOLING March 1, 1960 E. J. BOLING METHOD FOR GAUGING MATERIAL 3 Sheets-Sheet 2 J. aou NG EDGAR Filed April 22, 1957 March 1960 I E. J. BOLING 2,926,420

METHOD FOR GAUGING MATERIAL Filed April 22, 1957 3 Sheets-Sheet 3 llllll Illlll awe/Mm EDGAR J BOLING United 2,926,420 METHOD son GAUGING MATERIAL Edgar J. Boling, Columbus, Ohio Application April 22, :1957, Serial No.rs4,4sz

a 7 Claims. ores-401 The inventions disclosed 'and/orillustrated in this application'relateto methods of fabricating window. frames, as for example, frames for storm windows; to methods :offcomputing the required length of individual component members of :such frames; to methods of gauging and cutting framing :materials to the length so computed; to methods of computing unknown .lengths, required for component frame members, from the given' dim'ensions of .:a prime window, opening; and to methods ,of gauging and cutting such members to the length so computed. My inventions are illustrated as applicable to .storm windows.

ithas beenthegeneral practice'in the past for manufacturers-of prime window frames to work'from'standard glass sizes. .Little or no attention is given to the standardization of the resulting prime window opening to which ;a storm window must ultimately be fitted. The height and width dimensions of existing prime window openings tend to vary within .considerable limits as a result of various framing practices, various individual standards and manufacturingpractices followed by individual manufacturers of prime windows; and as a result of the type and design of thesill or lintel which is incorporated in the prime window installation in a building. There has beenno appreciable standardization of the dimensions of the window openings for'which storm windows are now being manufactured.

Conversely, storm windowsxmust be produced in volume .if their use is to be economically feasible. As a re- .sult it has been the common practice .in the past to fabricate storm windows to standardized dimensions which represent averages .of the various :dimensions which occur most frequently in prime window openings'. When storm windows produced .by such methods are installed one of .threercostly procedures.is followedin an effort to achieve an approximate. fit between the storm window and the prime .opening:' (.1) A storm window larger than the prime .opening .is planed .to .fit the opening, or (2) the prime opening must be shimmed orfurred to the dimensions of .thestormwindow, or (3) a storm window must be vshimmed, .furred or similarly fitted vto the actual dimensions .of .the;prime opening, or (4) the storm window 1 is so designed as to have an overlapping frame. Thelast two methods increase costs by the use of additional material. Wide conspicuous frames are undesirable for appearances.

.The planingprocess is so costly and inconvenient as to be impractical When applied to storm windows having metal frames and increases installation costs and damages the storm window. Shims or .furring strips are costly and time consuming to install, tend to multiply the problem of ca'lking the'installat'ion to vrender it weather tight, and are often subject .to rapid deterioration in use.

While it has heretofore been the common practice among manufacturers of storm windows to fabricate them to measurements exceeding by varying amounts the window manufacturers standard glass sizes, the inventor herein proposes as an innovation to fabricate such storm sions.

I ,2 windows according to prime window opening dimen- When custom fabricating a storm window to the approximate overall height and width dimensions of the prime window opening for which it is intended, it is necessary that the length of-each component member of the frame for such a window be individually computed from the dimensions of the prime window opening. Such computations when accomplished by previously known methods are time c'onsuming and subject to frequent costly errors which result in .wasted materials and effort, and tend to make such custom fabricating methods uneconomical to' use. No other apparatus or method known to mehas heretofore provided either a means or a method whereby storm windows can be fabricated to the approximate overall dimensions of a prime opening without costly and time consuming manual computation of the length dimension of each framing component of such a window.

' Objects One of the objects of my invention is to provide a method of computing by mechanical means the length dimensions of all frame members from given overall' A further objectof my invention is to provide a meth-- 0d of computingvarious length dimensions of extruded frame members,'which is equally effective and advantageous when used in the production of storm windows of a predetermined .size .as well as in the custom fabrication of such windows.

A further object of my invention is to provide novel and economical method of computing, gauging and cutting 'to length accurately and quickly, the component members of frames having variable overall or profile dimensions.

Further objects andfeatures of the invention will be apparent from the subjoined specification and claims when considered in connection with the attached drawings.

Drawings In the drawings which disclose .a preferred embodiment of my invention: Fig. '1 is a top .plan view of a computing and gauging apparatus in operating position on a work supporting surface, with a piece .of framing material shown in dashed lines and with the :mutually intersecting planes of operation of three cooperating cutting devices shown as dotdash lines;

Fig. 2 is a view in side elevation of the apparatus of Fig. '1;

Fig. 3 is a sectional view of the block of Fig. 1,' taken along line 3 3;

Fig. 4 is a sectional view of the material stop of Fig. '1 taken along line 4-4;

Fig. 5 is a view in side elevation of a portion of Fig. 2 here shown on an enlarged scale with other portions broken away and with spacer block interposed between the spacing screw and the shoulder of the material stop;

'Fig. 6 is a top plan view of the material stop of Fig. 5 showing several spacer blocks at rest on said stop in available positions;

Fig.- 7 is a view similar to Fig. .6 showing one spacer block'interposed between thestop shoulder and the spacmg screw;

vFig. 8 is ;a view similar .to Fig. .6 showing two spacer blocks interposed between the .spacingscrew and the stop shoulder;

Fig. 10 taken along the line 1111;.

block of different proportions interposed between the spacing screw and the stop shoulder;

Fig. 10 is a plan view of an assembled storm window of conventional two "track configuration;

Fig. 11 is a sectional view of the storm window of Fig. 12 is a plan view of the lower portion of the main frame of the storm window of Fig. 10 as seen at one stage in the assembly process;

Fig. 13 is a sectional view taken on the line 1313 of Fig. 1 and showing an alternative embodiment of the material stop of Fig. and a Fig. 14 is a view similar to Fig. 9 showing two spacer blocks interposed between the spacing screw and the stop shoulder. 1

The philosophy of my invention is that 'the overall dimension of a window manufactured under my inventio'n need be fairly accurate in order to fit the opening, but the differences in lengths between the interfitting and cooperating parts must be extremely accurate so that the parts may be assembled correctly. Thus the first overall dimension in width (or in length) may be measured and cut from a visual and rule or tape measurement accurate to 16ths or 32nds of an inch, but the differences between this first measurement and the width or length of cooperating parts must be determined very accurately so that visual measurement by rules or tapes is not sufficient, but extremely accurate gauge blocks accurate to thousandths of an inch should be used. Lengths of component parts in windows of mitered construction are not only controlled by the size of the window but also by the profile dimensions of the material used or the difference in 16 dimensions of the profiles of adjacent parts.

Detailed description Referring to the drawings for a detailed description of an embodiment of my invention illustrated, it may be seen that I have shown generally in Fig. 1, a gauging and mitering apparatus which consists of a suitable work supporting surface 15 of plane configuration; a guide bar 20 longitudinally disposed along one edge 19 of said surface 15 and rigidly secured thereto by suitable means; a suitable material feed guide 25; a block, generally designated as 30, slidably secured to guide bar 20; a material stop 40, slidably embracing guide bar 20; and spacer blocks 50 adapted to be at times interposed between an element of block 30 and an element of stop 40, each of which is described hereafter in detail.

A plurality of suitable cutting devices, as for instance saws (not shown), are secured to surface 15 by appropriate means so that said devices will be at times operable (either individually or in unison) within cutting planes 16, 17 and 18 (Figs. 1 and 2) for cutting framing materials as for example material 21 which is positioned on surface 15 for gauging and cutting purposes. Said planes 16, 17 and 18 are mutually tangent along a line which passes through a point adjacent edge 19 of surface 15 so as to be perpendicular with the plane of said surface 15.

Block means 30 is formed of suitable material to the general configuration illustrated in Figs. 2 and 3, with a channel 31 longitudinally disposed in the lower face 37 of block 30 and in intercommunication with opposite faces 38 and 39 of block 30. The cross-sectional configuration of said channel 31 (Fig. 3) is in close conformity with that of guide bar 20 and said channel 31 is of sufficient dimensions to permit block 30 to be at times slidable longitudinally of guide bar 20. Block 30 is further formed with a threaded bore 32 extending longitudinally through said block 30 in intercommunication with opposite faces 38 and 39, said bore 32 lying parallel with channel 31. Another threaded bore 33 is laterally disposed in block 30 in intercommunication between outer wall 29 of block 30 and a lateral wall of channel 31. Setscrew 34 is of suitable size and thread to be threadably engaged in threaded bore 33 for securing block 30 to guide bar 20. Vertically extending opening 37 is of appropriate configuration and intercommunicates with upper face 28 of block 30 and the upper wall of channel 31 to serve as the inspection port through which the calibrations 23 on guide bar 20 may be read. Pointer 27 is of suitable size and configuration and is fixedly secured by suitable means within a lateral bore of block 30 so as to extend into opening 37 an appropriate distance.

Material stop 40 is formed to the general configuration shown in Figs. 1, 2, 4 and 5 with channel 41 extending along its lower face 47 so as to intercommunicate with opposite vertical faces 48 and 49 of stop 40. Channel 41 has a cross-sectional shape similar to that of channel 31 of block 30 for slidably embracing guide bar 20. Material stop 40 is further formed with a material engaging portion 46, projecting from forward face 48 (Fig. 1), said portion 46 having an angularly disposed stop face 43 of plane configuration which is disposed perpendicular to lower face 47 of stop 40 and which intersects one lateral Wall 59 of said channel 41 so as to form an angle therewith which is the supplement of the smaller of the angles formed by the intersection of cutting plane 18, and guide face 24 of guide bar 20. Material stop 40 is also formed with a spacer block shelf 42 (Fig. 5) disposed adjacent to rear wall 49, parallel with lower face 47 displaced from said face 47 a distance less than the shortest distance between the major diameter of threaded bore 32 of block 30 and lower face 37 of said block 30. Material stop 40 is further formed with a vertically extending shoulder portion 44 having a rearwardly disposed shoulder face 45 which intersects shelf 42 so as to lie perpendicular thereto and said face 45 also lies in a plane perpendicular to the longitudinal axis of said channel 41.

Spacing screw 35 (Fig. 1) has an appropriate diameter and thread to be threadably engaged in said threaded bore 32 of block 30 and is of sufficient length to extend through block 30 and to project therefrom a distance greater than the length of spacer shelf 42, as measured along a line parallel with the axis of channel 41 of material stop 40. Said screw 35 is provided with a suitable head 36 for rotating screw 35 within threaded bore 32 and a locking nut 26 for locking screw 35 in any position with respect to blo'ck 30.

Spacer blocks generally designated as 50 (Fig. 6) comprise a plurality of gauge blocks 51, 52, 53 and 54, each being parallelepiped in configuration, having two common dimensions and the third dimension (hereafter called the effective width) of each said block being an appropriate dimension which is determined by the variations between the overall length dimensions of two component elements of a storm window frame as will be described in detail hereafter.

The upwardly disposed face 22 (Fig. 1) of guide bar 20 is provided with a scale 23 for indicating linear distance as measured along material guide face 24. Scale 23 is so calibrated that a linear dimension corresponding to that of a prime window Opening (such as either dimension X or Y of Fig. 10) is in register with pointer 27 of block 30 when the actual distance, measured along guide face 24, between cutting plane 18 and material stop face 43 is equal to the longest dimension of the longest frame member which is to be cut from said dimension of a prime window opening, as for example dimension Z (Fig. 12) of member 61 which is cut from horizontal dimension Y (Fig. 10) of prime window opening 100.

Alternatively the material stop shown in the rear elevational view of Fig. 13 may be incorporated in the apparatus previously described for maintaining specificv sets of gauge blocks 138 and 139 in orderly arrangement and thereby simplify and speed the operation of the ap paratus. Material stop 120 is identical with material stop 40 (Fig. 4) and is formed with longitudinal channel 121-, forwardly extending material engaging portion 126, gauge block shelf 122 perpendicular-to and extending of vertical-shoulderportion124. Material-stop 120 (Fig.

13) differs ftom stop 40 (Fig; '4) in that a pluralityof spacer block retaining means are provided, as for instance spacer guiderods 123. Said-rods 123 are rigidly securedto shoulder portion 124 of material stop 120 and project rearwardly from face 125 so as to extend parallel with shelf 122 and to be spaced vertically therefrom.

Spacer blocks 131, 132 and 133 are'each provided with an elongated slot 128jwhich extends through the effective width of said spacer block so as to be in in'tercommunicav 'tion with-both the forward and'rear faces of each said spacer block 131, 132 and 13s. Slots 12's are so dimen-,,=

sioned as to permit a rod 123 to be slidable. therein. A

plurality of spacer blocks such as 131 and 132 arealigned inside by side relationship along a 'rod 123 so as to be slidably repositioned attimes, either individually or in series relationship, into'thefpositionof block 131 with opposite faces in contact engagement respectively with shoulder face 125 and with the forwardly projecting end of spacing screw 35. r

Collars 127 are slidable longitudinally of rods -132'and are secured thereto by means of suitable 'sets'c'rews (not shown) for retaining prearranged sets of appropriate spacer blocks such as 138'and 139 in mutual :side by side relationship on shelf 12?. so as to bere'ciproeally slidable transversely thereof. V

, Operation The gauging and miteringapparatus described herein is used to effective advantage in custom fabricating frames for storm windows to the actual dimensions t5 the prime window opening in which the fabricated storm window isto be installed as well as in the productiori of storm windows to predetermined standardized overall dimensions. An illustrative storm windowasserntily' of two track design is shown in Figs. l0.and l l which comprises p 2 means of head 36 to bring the forwardlyjprojecti-ng end I of screw 35 into contact engagement with rear wall. 45

of stop 40.

A suitable length of training material extruded to the V cross-sectional configuration shown at 61 in Fig. 1.1 (or to such other cross-sectional configuration as may be necessary to the structure ofthe ultimate storm window) is positioned on surface-15of Fig. 1 as indicated at detail 21 so asto be in longitudinal engagement with material guide 25 and to extend through cutting plane 16. Said material is then cut along the line of intersection of cutting plane .16.

Said material is then out along the line of intersection of cutting plane .16., The angular leading terminal end of said material thus formed is next-positioned as at 21 in contact engagement with material engaging face 43 while shoulder faceAS bears directly upon the projected end of screw 35 (Fig, 6) and saidtnaterial 21 is then cut along both lines of intersection of cutting planes 16 and 18m form a frame member :61 of main frame 60 (Fig. 10).

Material stop 40 is repositioned along guide bar-20 in the direction of cutting plane 18 a sufficient distance to allow gauge block 51 to be interposed (Fig. 7) between a main frame generally designated as 60 andan upper insert window frame 70, a lot/er insert window frame 80 and an insert screen frame 90 each of which is slidably retainedwithin frame 60 by suitable spring means 75 secured to main frame 60.

Individual component members of mainframes 60 and insert frame". 70, 80 and 90316 normally cut to the required length from extruded framing materials having the desired cross-sectional configuration. For purposes of illustration, specific crossrsetional width rela tionships between various framing components will be described hereinafter, based upon the 'specifie storm window structure illustrated in Figs. 10, ll and 12. It is understood, however, that. the described relationships will vary, depending on the type and configuration of the ultimate storm window assembly which is contemplated. In

dimension Y (Fig. 10) and block is secured in such.

position by tightening setscrew 34 against guide bar 20.

Spacing screw 35 is then threaded through threaded bore 32 of block 30 sufficiently, far for the forward end of screw 35 to project beyond face 38 a distance gr'eater than the previously described length of spacer shelf 42 of material stop 40.

Stop 40 is slidably positioned longitudinally of guide bar 20 with stop face 43 directed toward cutting plane 18 and spaced therefrom a distance (measured along face 24 of guide bar 20) equal to dimension 2 (Fig. 12) of the longest horizontal frame member 61'to be cut 'from dimension Y (Fig. 1.). Screw 35isathe'n rotated by face 45 and screw 35 for separating said face 45 and screw -35 by a distance equal to the effective width of block 51. i

Spacer block is very accurately formed and has an effective width equal to twice the difference between the overall cross-sectional width of the material used in member 61, as measured in the plane of Fig. 10,'and the overall cross-sectional width of the material from which member 62 is to be formed.

A suitable length of appropriate material of configuration of member 62 having a terminal edge out along the line of plane 16 is then positioned as at 21 (Fig. 1.) 'in longitudinal engagement with guide bar 20 and with said terminal edge in engagement with face 43, face '45 of stop 40 being in engagement with one face of spacer block '51 (Fig. 7.) and the opposite face of said'spacer block 51 bearing upon the projecting end of screw 35.- This material is then-cut along-the lines of cutting planes 16 and 18 to form a member 62 and to form an angular terminal edge on the remaining length of the material.

Material stop 40 is again repositioned along guide bar 20 in the direction of cutting plane 18 a distance sufficient to allow spacer block 52 to be interposed (Fig. 7

8) between spacer block 51 and screw 35.

Spacer block 52 (Fig. 8)-has an effective width equal to the sum of twice the cross-sectional-width where inserts fit of the material from which members 63 and .64 of frame 60 will be formed (as described hereafter) plus a suitable predetermined dimensional tolerance required to assure a snug but smoothly sliding fit'between members 63 and 64 of assembled main frame'60 and insert frames 70, and 90. I

A length of material having appropriate cross sectional configuration for forming members 71, 72, 81, 82 and 91. and 920i insert frames 70, 80 and respectively, and

having a leading terminal edge out along the line of plane 16, is then positioned as described above as at 21 with said terminal edge in engagement with face 43.

and 92 of insert frames 70, .80 and 90 are cut to therequired lengths as previously described, block 30 (Fig. I and stop 40 arerepositioned along guide bar 20 'to the position where pointer 27 isin register with the point on the scale'23 of guide bar 20 ,which indicates a linear value "7 equate vertical dimension X;=(Fig. of prime window openinglOl].

Spacer, blocks 51 and 52 are then removed from their central position on shelf 42 shown in Fig. 8 toth e position of Fig. 6 in which said blocks are aligned along and adjacent an outer edge of shelf 42. Stop 40 is then slidably repositioned along guide bar a sufiicient distance to permit a spacer block 53 to be interposed with opposite faces in contact engagement with face 45 and with the projecting cnd of screw 35 respectively.

Spacer'blocks 53 (Fig. 9) has an effective width equal to three times the difference between the cross-sectional widths of materials used to form main frame members 61 and 62 plus a suitable fitting allowance. Suitable framing material is then cut in the manner previously described to the length dimension gauged by the relative positions of material stop face 43 and cutting plane 18 (Fig. l), to form main frame members 63 and 64.

To form vertical members 73, 74, 83, 84, and two members 93 of insert frames 70, 80 and 90, block and stop 40 (Fig. 1) are repositioned, as previously described, along guide bar 20 to a position wherein pointer 27 is in register with the calibration of scale 23 which indicates a linear value equal to one half of vertical dimension X (Fig. 10). Stop 30 is then secured to guide bar 20 by means of setscrew 34 as previously described.

With block 30 secured in position along guide rail 20 as just described and with spacer block 53 remaining in the last described position on shelf 42, spacer block 54 is interposed between spacer block 53 and the forwardly disposed end of spacing screw 35 as shown in Fig. 14.

Spacer block 54 has an effective width equal to one half the sum of the respective cross-sectional effective widths-of the extruded materials, from which members 61 and 62 were formed as described above, less one half the difference between the cross-sectional widths of said materials of'members 61 and 62 and less'a suitable fitting allowance.

With block 30, screw 35, spacer blocks 53 and 54 and stop in the relative positions last described, material of similar cross-sectional configuration and dimension to that from which horizontal insert framemembers 71', 72, 81, 82, 91 and 92 were formed, as previous- 'ly described, is cut to the length gauged by face 43 of stop 40 to form said vertical members 73, 74, 83, 84, 93 and 94 of insert frames 70, 80 and 90. a

Insert frames 70, 80 and 90 are then assembled'to the general configuration shown in Fig. 10 and the projecting triangular sections 68 and 69 (Fig. 12) are removed fromv main frame 60. For instances projection 68 is removed by positioning main frame on surface 15 with a straight side aligned along guide bar 20, with a projection 68 extending across cutting plane 17, and by cutting off said projection 68, along the outside line of the outer edge of adjacent member 63. Projection 69 is similarly removed.

This application is a continuation, in part, of my copending application Serial No. 653,697, filed April 18, 1957.

It is to be understood that the above described embodiments and methods of my inventions are for the purpose of illustration only and various changes may be made therein without departing from the spirit and scope of my invention.

I claim:

1. In the construction of a frame having a' plurality of horizontal and vertical components of known crosssectional dimensions and of various unknown lengths, a method of gauging and cutting extruded framing materialsto required lengths which consists (1) in feeding random lengths of materials having known cross-sectional dimensions onto a' work-supporting surface; (2) aligning said material along a fixed guide bar .in such position that said material extends through and'projects beyond a cutting plane with the leading terminal edge of said material contacting a material stop spaced from said cutting planea distance which deviates from a known horizontal dimension by the magnitude of a known approximate variationj (3) cutting said material to form the longest horizontal frame component along the line of intersection of said material with said cutting plane; (4) aligning said material as aforesaid with said material stop spaced nearer to said cutting plane by the magnitude of a known, accurate variation; (5) cutting said material along said line'of intersection to form a shorter horizontal frame component; (6) repeating the fourth and fifth steps to form the required number of horizontal frame components; (7) aligning said material as aforesaid with said material stop spaced from said cutting plane a distance which deviates from a known vertical dimension by the magnitude of a known approximate dimension; (8) cutting said material as aforesaid to form the longest of said vertical frame components; (9) aligning said material as aforesaid with said material stop spaced nearer to said cutting plane than the distance last described by the magnitude of a known, accurate variation; (10) cutting said material as aforesaid to form a shorter vertical frame component; (11) repeating the ninth and tenth steps to form the required number of vertical frame components; (12) and assembling said components into a frame configuration.

2. In the construction of a window having a plurality of substantially horizontal components of varying length, the cutting of a horizontal component to an approximately accurate dimension using relatively wide tolerances; the cutting of a second horizontal component having a different length to a dimension differing from said first component by extremely accurate dimensions by gauging the length of said second component solely as a function of the length of said first component and of the predetermined difference in length between said component using very close tolerances; and assembling said components.

3. In the construction of a window having a plurality of substantially vertical components of varying length, the cutting of a vertical component to an approximately accurate dimension using relatively wide tolerances; the cutting of a second vertical component having a different length to a dimension differing from said first component by extremely accurate dimensions by gauging the length of said second component solely as a function of the length of said first component and of the predetermined difference in length between said components using very close tolerances; and assembling said components.

"4. A method for the construction of a window having several components of varying length comprising cutting of the component having the longest length to an approximately accurate but not necessarily exact dimension; the cutting of the components having shorter lengths to dimensions differing from said first component by extremely accurate variationsby reference solely to the dimensions of said longest length component as modified by accurate differentials of the differences between said longest component and said shorter components; and assembling said components.

5. In the construction of a frame having several components of varying lengths for installation in an opening having known dimensions, the method which comprises vcutting one of the components to a length which varies from one of said known dimensions by the amount of a constant approximate but not necessarily exact variation;

cutting other components the lengths of which differ from the length of said first cut component by an amount known 'to be constant within narrow tolerances by gauging saidother components very accurately solely by the length'of said first named component as modified by the accurate known differences between the lengths of said components; and assembling said components.

6. 'In'thefabrication of a frame for installation in an 9 opening having known horizontal and vertical dimensions, such frame having horizontal and vertical components of various lengths, the method of forming said frame which comprises gauging and cutting extruded framing mate'- rials to required lengths by cutting one of said horizontal components to a length which differs from said known horizontal dimension by the magnitude of a known approximate variation; cutting each of the other of said horizontal components to a length which varies from the length of said first named horizontal component by the magnitude of a known accurate variation by comparing each of said other horizontal components solely With the first named horizontal component and with the known accurate dilferences in length between said two horizontal components; cutting one of said vertical components to a length which diflers from said known vertical dimension by the magnitudeof a kown approximate variation; cutting each of the other of said vertical components to a length which varies from the length of said first named vertical component by the magnitude of a known accurate vertical variation by gauging each of said other components solely as a function of said first named component and of the predetermined known accurate differences between the length of said components; and assembling said components.

7. In the fabrication of a mitered frame, having horizontal and vertical components of varying lengths for use in a storm window which is custom fitted to the known horizontal and vertical dimensions of a prime window opening, a method of gauging and cutting lengths of extruded priming framing material to the lengths required for such frame, which consists in gauging the longest of said horizontal components to a length different from said known horizontal dimension by the magnitude of a known approximate variation; cutting the longest horizontal member to the length so gauged; gauging each of the shorter of said horizontal components to a length lesser than the length of said longest horizontal component by the magnitude of a known accurate variation solely by decreasing the length of said longest horizontal component by the magnitude of said known accurate variation; cutting said shorter horizontal components to the lengths so gauged; gauging the length of the longest of said vertical components to a length difi'erent from said known vertical dimension by the magnitude of a known approximate variation; cutting said longest vertical component to the length so gauged; gauging each of the shorter of said vertical components to a length lesser than the length of said longest vertical component by the magnitude of a known accurate variation solely by decreasing the length of said longest vertical component by the magnitude of said known accurate variation; cutting each of the shorter vertical components to lengths so gauged; and assembling said components to a frame configuration.

References Cited in the file of this patent UNITED STATES PATENTS 1,915,398 Bedell June 27, 1933 1,934,765 Julien Nov. 14, 1933 2,697,997 Burroughs Dec. 28, 1954 2,707,321 Breisch May 3, 1955 2,742,690 Kunkel Apr. 24, 1956 

